<template>
    <div>
        {{ message }}
        <button @click="greet">问候</button>    
    </div>
</template>

<script>
export default {
    data() {
        return {
            message:'hello,friend!'
        }
    },
    methods:{
        greet(){
            this.message = 'hello,'+this.$attrs.name+'!'
        }
    }
}
</script>